When I figure out my fees for any freelance job I have, my formula goes like this:

(My Expences +15%)+ ((My time*My Rate)+15%)+(How much $$ it takes to bribe me to put up with the client)=fee

It is amazing how hight the third item can be /or in the case of one group that is so wonderful to work with, it is actually a negative number, because they make the job so easy, I never put in as many hours I think I should.

Granted, what I wear when I work is never part of the issue -- the public never sees me.

Cheers
Chris